Actually this is an expected (but unfortunate) feature of
markdown formatting. Markdown allows the use of html tags,
including script, apparently. The reason this shows up unformatted
on rubydoc but not github is that the README is using Github
specific markdown formatting but did not enable it on rubydoc.info,
so it's not being recognized as a codeblock on the site, and
therefore parsed as HTML. It's possible that we could start
manually sanitizing script tags from all formatted html, but I'd
rather not have to do this, as we should be able to trust our
library authors to use their powers responsibly.